Posts Tagged ‘pulley’

Systems performance task

Sunday, November 7th, 2010

You will try and put together much of the ideas we have been learning over the past months with this assignment.  You will choose one of the following systems to design:

  • Design a system to transport mangoes from the Philippines to France.
  • Design a system to detect typhoons/earthquakes/ tsunamis etc, and warn people.
  • Design a system to lift an injured elephant from the ground onto a truck (1.5m high).
  • Design a system to help a person with diabetes maintain a constant sugar level in their blood.

You make work alone or with a partner.  Start by reading this rubric:  Rubric for systems performance task

Pulley systems

Thursday, August 19th, 2010

pulley by Todd Huffman on flickr

Another type of simple machine, besides the lever, is the pulley.  Pulleys can be fixed or movable, and they can be used singly or combined with other pulleys to make pulley systems.  Take a look at this clip to learn a little bit more about pulleys, and be introduced to the idea of mechanical advantage.  And here’s Tim and Moby’s explanation of the same concepts.  If  you want to go further, try reading this.

You are going to (hopefully) get a better understanding of pulley systems by doing an experiment.  Here is the instruction sheet: Pulley lab instruction sheet   Pulley lab data sheet

And finally, once you have understood pulley systems and mechanical advantage properly, you can demonstrate your understanding by designing a pulley system to lift an elephant off the ground into a truck of height 1m.  I can’t wait to see what you come up with!